Rock-drill



- UNITED STATES erniv'r AARON J. MERSHON, OF WARSAW, INDIANA.

ROCK-DRILL.

SPECIFICATION forming part Of Letters Patent No. 251,723, dated January3, 1882.

Application filed November 10, 1881. (No model.)

To all whom it may concern Be it known that I, AARON J. Mnnsnou, acitizen of the United States, residing at Warsaw, in the county ofKosciusko and State of Indiana, have invented certain new and usefulImprovements in Rock-Drills; and I do hereby declare the following to beafull, clear, an d exact description of the invention, such as willenable others skilled in the artto which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters orfigures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in rock-drills to be operated byhand or other power,it being designed as an improvemcnton the one forwhich Letters Patent were issued to me on the 1st day of May, 1877, No.190,232, the object of my present improvements being to provide newdevices for raising the drill, and novel combinations thereof, wherebysaid drill may be operated more rapidly and etfectively, as will be morefully described hereinafter. I attain these objects by the mechanismillustrated in the accompanying drawings,

,in which- Figure 1 is a perspective view, showing the parts of themachine in position for operation upon an adjustable frame. Fig. 2 is aplan View of a portion of. the machine, showing a portion of the frameand of the axle, the balance-wheel, the lifting and depressing arms, thepivoted lever which aids in placing the lower arm in position, and aportion of the guide for the upper one; and Fig.3 is a verticalelevation, partly in section, showing a portion of the driving-shaft,one of its hearings, the balance-wheel with one of its lifting sockets,the lifting and depressing arms, the rod for aiding in bringing the onewhich lifts the drill into position, and the drill-stock.

Similar letters refer to similar parts throughout the several views.

In constructing drills of this type having my improvements embodiedtherein I provide a suitable frame, A, which may be of iron or wood, ithaving brackets A A in its corners, through which pass screw-bolts A Afor the purpose of adjusting said frame to its pgoper position, eitheron a level or at an ang e.

To the frame, at proper points, there are attached brackets B B, (or afmme-work,) which carry upon their upper surface bearings for the shaltB to rotate in, said brackets being so placed as to support the shaft asnear to its ends as practicable. This shaft is provided upon one of itsouter ends with a crank. 13*, for rotating it by .hand, or it may be apulley or gear-wheel, by which it may be driven by any convenient power.To the opposite end of shaft B there is secured a balance-wheel, C, theouter face of which is provided with two or more cup-shaped projections,C and G which, when the wheel is rotated, lift the drill by coming incontact-with an arm placed thereon, said projections being placed atsuch a distance from the center of the axle as to give the required liftto the drill,and they may, if preferred, be made adjustable on thewheel, and thus rendered capable of giving a greater or less liftthereto.

The shaft B may be extended through the wheel 0 and have a crank uponits end, as shown in Fig. 2, so that when the drill is operated by handtwo persons may be employed for that purpose at the same time.

To the end of the framewhich is nearest the balance-wheel there issecured a post or column, D, which rises sufficiently high to cause itto support the drillstock, it being provided upon its inner surface withprojections D and D which are furnished with holes, through which thedrill-stock E passes. Upon the stock E there are placed two arms, E andE the upper one projecting into a groove or recess formed in the innerface of the column D for its reception, and it has attached to its innerI end a spiral spring, E the lower end of which is attached to the.columnor to the frame, in order that as the drill-stock, after beingraised by the projections on the balance-wheel, is relieved from thecontrol thereof, an impetus may be given to its downward movement by theaction of said spring, the drill-stock and the drill being allowed tocontinue their'downward movement after the spring hasbeen fullyretracted, owing to the fact that the stock passes loosely through thesocket formed in the arm E The arm E is used for raising the dlrill, it,like E having a socket in one of its ends,

through which the stock passes freely, while its opposite end extendstoward the balancewheel sufficiently far to permit each of theprojections thereon to come in contact with it, and so carry the drillstock up, in doing which the arm is caused to partially rotate upon thestock, it being thus released from the control of said projections. Thisleaves the arm out of the path of the succeeding projection,and thedrillwould cease to be operated but that provision is made for returning itto its proper place, which is accomplished in the manner now to bedescribed.

To the frame A there is pivoted a lever, F, which extends upward, and ispassed through an eyebolt secured in the arm E, or it may be through aprojection formed thereon, and

is continued upward therefrom to the required distance. This lever is soplaced and formed that when the free end of the arm E is out of the pathof t he approachingprojection said projection come-s in contact with thelever, and so turns the arm and brings it into the path of theprojection in time to cause it to carry the drill-stock up with it.

The drill, which may be of any approved form and of any desired size, isplaced in a socket upon the lower end of the stock, to which it may besecured in an y approved manner.

For the purpose of giving additional force to the drill, there is placedupon the outer endv Having thus described myiuvention,what I claim, anddesire to secure by Letters Patent, is

1. The combination, in a rock-drill to be driven by hand or other power,of a balancewheel, 0, having upon its face segmentallyformedlifting-projections, a lifting-arm for raising the drill, a drill-stock,said arm being placed loosely upon the drill-stock so as to turnthereon, an arm for giving impetus to the downward movement ot'thedrill, and a spring for aiding such movement, all substantially asdescribed.

2. The combination of the adjustable frame A,the column D, drill stockE, and spring E substantially as shown and described.

3. The combination of the pivoted lever F and the arm E, substantiallyas and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

AARON J. MERSHON.

Witnesses:

Owens 0. HUMPHREYS, MORDEOAI PHENEGER.

